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( Fig. 1 ). Therefore, the newborn was transferred to a neonatal intensive care unit, where continuous positive airway pressure was administered. In addition, blood test results showed high levels of hemoglobin (Hb; 23.1 g · dL −1 ) and hematocrit (Hct; 69.2%), indicating polycythemia. During hospitalization, Hb and Hct levels increased to 24.2 g · dL −1 and 70.0%, respectively ( Fig. 2 ). Echocardiography revealed patent ductus arteriosus and mild pulmonary arterial hypertension. Despite adjustments to the ventilation strategy, the newborn’s respiratory distress